FS1 servo problem...any suggestions?

[Naushad]

Hi,

I just finished rebuilding my Kyosho ZX5 FS1.

So I took the car outside just to test drive it. The surface was tarmac, so I adjusted the slipper accordingly. The Speedo is a KO PROPO VFS-1 BMC and I've got an Orca 8.5T installed.

When I attempted to steer (whilst on throttle) the centre point of my servo goes offline as it returns. This happens frequently to the extent I have to repeatedly adjust my sub-trim on the transmitter to find the centre point (I'm using a Ko Esprit 3). Obviously, this is very frustrating and I can't race! I don't get this problem with my Bmax4 however.

Now, I've got a KO PROPO 2133 FET servo installed. Although I haven't had time to look into the issue in more detail, I intend to check the servo itself (which I doubt is faulty) and the attached saver. I may swap servos to check, but this is so much hassle!!

Could it be that the sheer torque from my brushless motor is proving too much for the servo to handle? Or is the servo losing power? (i.e. which a capacitor issue may resolve)

Any suggestions would be welcomed!

[discostu]

Originally Posted by Naushad

Hi,

I just finished rebuilding my Kyosho ZX5 FS1.

So I took the car outside just to test drive it. The surface was tarmac, so I adjusted the slipper accordingly. The Speedo is a KO PROPO VFS-1 BMC and I've got an Orca 8.5T installed.

When I attempted to steer (whilst on throttle) the centre point of my servo goes offline as it returns. This happens frequently to the extent I have to repeatedly adjust my sub-trim on the transmitter to find the centre point (I'm using a Ko Esprit 3). Obviously, this is very frustrating and I can't race! I don't get this problem with my Bmax4 however.

Now, I've got a KO PROPO 2133 FET servo installed. Although I haven't had time to look into the issue in more detail, I intend to check the servo itself (which I doubt is faulty) and the attached saver. I may swap servos to check, but this is so much hassle!!

Could it be that the sheer torque from my brushless motor is proving too much for the servo to handle? Or is the servo losing power? (i.e. which a capacitor issue may resolve)

Any suggestions would be welcomed!

its probably the nut on the servo saver to loose and biding againts the top deck stopping the servo centralising properly

stu

[Naushad]

Ta Stu..I'll take your suggestions on board!

[aberscoob]

I will second DiscoStu's theory as the exact same thing has happened to me a couple of times mid race! usually ends up with me only being able to turn in one direction
im not using an FS just an RTR though but i would think the setup will be very similar.

I now tend to check it before each run just to be sure!

Cheers,

Steve.

[Naushad]

Just another thing.

When I manually turn the front wheels left or right to the extremes there is some extra give not covered by the servo. Do I need to shorten my steering turnbuckles - although the toe-out config may disappear altogether.

[RogerM]

Never known the above on a kit built FS ... sometimes with the aftermarket steering racks though.

Check everything is as per the manual and make sure you are using a Kyosho servo horn.

[Naushad]

I've spent two hours on this and I've come to the conclusion there is binding in the steering. I've looked at everything systematically The servo seems unsettled when the returning to centre.

I think it's the bit with the spring that's binding...I've got a alloy replacement so I'll replace it with this. I'll also look a the bearing.

[RogerM]

Thinking about it check the bushings in the steering rack, lots of people get the washer order incorrect / missing / bolts cranked down FAR too tight.